Abstract
The psaE gene, encoding a 7.5 kDa peripheral protein of the photosystem I complex, has been cloned and characterized from the cyanobacterium Synechococcus sp. PCC 7002. The gene is transcribed as an abundant monocistronic transcript of approximately 325 nt. The PsaE protein has been overproduced in Escherichia coli, purified to homogeneity, and used to raise polyclonal antibodies. Mutant strains, in which the psaE gene was insertionally inactivated by interposon mutagenesis, were constructed and characterized. Although the PS I complexes of these strains were similar to those of the wild type, the strains grew more slowly under conditions which favour cyclic electron transport and could not grow at all under photoheterotrophic conditions. The results suggest that PsaE plays a role in cyclic electron transport in cyanobacteria.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Amino Acid Sequence
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Base Sequence
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Cloning, Molecular
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Cyanobacteria / genetics*
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Escherichia coli / genetics
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Genes, Bacterial*
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Genes, Plant*
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Glutamate-tRNA Ligase / genetics
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Molecular Sequence Data
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Mutagenesis, Insertional
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Photosynthetic Reaction Center Complex Proteins / biosynthesis
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Photosynthetic Reaction Center Complex Proteins / genetics*
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Photosystem I Protein Complex*
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Plant Proteins / biosynthesis
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Plant Proteins / genetics*
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Plants / genetics
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Recombinant Fusion Proteins / biosynthesis*
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Sequence Alignment
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Sequence Homology, Amino Acid
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Species Specificity
Substances
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Photosynthetic Reaction Center Complex Proteins
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Photosystem I Protein Complex
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Plant Proteins
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Recombinant Fusion Proteins
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photosystem I, psaE subunit
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Glutamate-tRNA Ligase